diff --git a/tests/script/fullGeneralSuite.sim b/tests/script/fullGeneralSuite.sim
index 2cd22362005de07eb2a02b1d0fadec9fc8bdca08..937265753323a41e51ddf9a3be0061c66b6c586a 100644
--- a/tests/script/fullGeneralSuite.sim
+++ b/tests/script/fullGeneralSuite.sim
@@ -135,6 +135,7 @@ run general/parser/tags_dynamically_specifiy.sim
 run general/parser/set_tag_vals.sim
 #unsupport run general/parser/repeatAlter.sim
 #unsupport run general/parser/slimit_alter_tags.sim
+run general/parser/precision_ns.sim
 run general/stable/disk.sim
 run general/stable/dnode3.sim
 run general/stable/metrics.sim
diff --git a/tests/script/general/parser/precision_ns.sim b/tests/script/general/parser/precision_ns.sim
new file mode 100644
index 0000000000000000000000000000000000000000..3e9a2dd3ffdcd1f15e05c28273af9484e33840d4
--- /dev/null
+++ b/tests/script/general/parser/precision_ns.sim
@@ -0,0 +1,113 @@
+system sh/stop_dnodes.sh
+
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c walLevel -v 1
+system sh/exec.sh -n dnode1 -s start
+sleep 1000
+sql connect
+
+$dbPrefix = m_di_db_ns
+$tbPrefix = m_di_tb
+$mtPrefix = m_di_mt
+$ntPrefix = m_di_nt
+$tbNum = 2
+$rowNum = 200
+$futureTs = 300000000000 
+
+print =============== step1: create database and tables and insert data
+$i = 0
+$db = $dbPrefix . $i
+$mt = $mtPrefix . $i
+$nt = $ntPrefix . $i
+
+sql drop database $db -x step1
+step1:
+sql create database $db precision 'ns'
+sql use $db
+sql create table $mt (ts timestamp, tbcol int) TAGS(tgcol int)
+
+$i = 0
+while $i < $tbNum
+  $tb = $tbPrefix . $i
+  sql create table $tb using $mt tags( $i )
+
+  $x = 0
+  while $x < $rowNum
+    $cc = $futureTs + $x * 100 + 43
+    $ns = $cc . b
+    sql insert into $tb values (now + $ns , $x ) 
+    $x = $x + 1
+  endw 
+
+  $i = $i + 1
+endw 
+
+sql create table $nt (ts timestamp, tbcol int)
+$x = 0
+while $x < $rowNum
+    $cc = $futureTs + $x * 100 + 43
+    $ns = $cc . b
+    sql insert into $nt values (now + $ns , $x ) 
+    $x = $x + 1  
+endw
+
+sleep 100
+
+print =============== step2: select count(*) from tables
+$i = 0
+$tb = $tbPrefix . $i
+
+sql select count(*) from $tb
+
+if $data00 != $rowNum then
+  print expect $rowNum, actual:$data00
+  return -1
+endi
+
+$i = 0
+$mt = $mtPrefix . $i
+sql select count(*) from $mt
+
+$mtRowNum = $tbNum * $rowNum
+if $data00 != $mtRowNum then
+  print expect $mtRowNum, actual:$data00
+  return -1
+endi
+
+$i = 0
+$nt = $ntPrefix . $i
+
+sql select count(*) from $nt
+
+if $data00 != $rowNum then
+  print expect $rowNum, actual:$data00
+  return -1
+endi
+
+print =============== step3: check nano second timestamp
+$i = 0
+$mt = $mtPrefix . $i
+$tb = $tbPrefix . $i
+sql insert into $tb values (now-43b , $x ) 
+sql select count(*) from $tb where ts<now
+if $data00 != 1 then
+  print expected 1, actual: $data00
+endi
+
+
+print =============== step4: check interval/sliding nano second
+$i = 0
+$mt = $mtPrefix . $i
+sql_error select count(*) from $mt interval(1000b) sliding(100b)
+sql_error select count(*) from $mt interval(10000000b) sliding(99999b)
+
+sql select count(*) from $mt interval(100000000b) sliding(100000000b)
+
+print =============== clear
+sql drop database $db
+sql show databases
+if $rows != 0 then 
+  return -1
+endi
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
diff --git a/tests/script/general/parser/testSuite.sim b/tests/script/general/parser/testSuite.sim
index 6265fc3a02822f3a5d2f5a8d52fcd1e7252c8585..30d655d9483529fa3880cfa76b5510f45f5348ec 100644
--- a/tests/script/general/parser/testSuite.sim
+++ b/tests/script/general/parser/testSuite.sim
@@ -61,4 +61,5 @@ run general/parser/binary_escapeCharacter.sim
 run general/parser/between_and.sim
 run general/parser/last_cache.sim
 run general/parser/nestquery.sim
+run general/parser/precision_ns.sim
 
diff --git a/tests/script/regressionSuite.sim b/tests/script/regressionSuite.sim
index d5742cd98ff4184d50c256309c807e0b19bbe1c2..bada2f655202ddc34ce6e67e718336a2afc41d50 100644
--- a/tests/script/regressionSuite.sim
+++ b/tests/script/regressionSuite.sim
@@ -134,6 +134,7 @@ run general/parser/bug.sim
 run general/parser/tags_dynamically_specifiy.sim
 run general/parser/set_tag_vals.sim
 run general/parser/repeatAlter.sim
+run general/parser/precision_ns.sim
 ##unsupport run general/parser/slimit_alter_tags.sim
 run general/stable/disk.sim
 run general/stable/dnode3.sim
diff --git a/tests/tsim/src/simExe.c b/tests/tsim/src/simExe.c
index c5b8d5c5ebf1da4dd5072282cef336c0648f1354..7d74946e939bb5f34f81ef6a6aee56a31c4a6cfe 100644
--- a/tests/tsim/src/simExe.c
+++ b/tests/tsim/src/simExe.c
@@ -813,8 +813,15 @@ bool simExecuteNativeSqlCommand(SScript *script, char *rest, bool isSlow) {
               value[length[i]] = 0;
               // snprintf(value, fields[i].bytes, "%s", (char *)row[i]);
               break;
-            case TSDB_DATA_TYPE_TIMESTAMP:
-              tt = *(int64_t *)row[i] / 1000;
+            case TSDB_DATA_TYPE_TIMESTAMP: {
+              int32_t precision = taos_result_precision(pSql);
+              if (precision == TSDB_TIME_PRECISION_MILLI) {
+                tt = (*(int64_t *)row[i]) / 1000;
+              } else if (precision == TSDB_TIME_PRECISION_MICRO) {
+                tt = (*(int64_t *)row[i]) / 1000000;
+              } else {
+                tt = (*(int64_t *)row[i]) / 1000000000;
+              }
               /* comment out as it make testcases like select_with_tags.sim fail.
                 but in windows, this may cause the call to localtime crash if tt < 0,
                 need to find a better solution.
@@ -829,9 +836,16 @@ bool simExecuteNativeSqlCommand(SScript *script, char *rest, bool isSlow) {
 
               tp = localtime(&tt);
               strftime(timeStr, 64, "%y-%m-%d %H:%M:%S", tp);
-              sprintf(value, "%s.%03d", timeStr, (int32_t)(*((int64_t *)row[i]) % 1000));
+              if (precision == TSDB_TIME_PRECISION_MILLI) {
+                sprintf(value, "%s.%03d", timeStr, (int32_t)(*((int64_t *)row[i]) % 1000));
+              } else if (precision == TSDB_TIME_PRECISION_MICRO) {
+                sprintf(value, "%s.%06d", timeStr, (int32_t)(*((int64_t *)row[i]) % 1000000));
+              } else {
+                sprintf(value, "%s.%09d", timeStr, (int32_t)(*((int64_t *)row[i]) % 1000000000));                
+              }
 
               break;
+            }
             default:
               break;
           }  // end of switch