diff --git a/modules/planning/common/path/frenet_frame_path.h b/modules/planning/common/path/frenet_frame_path.h
index cc3f978d8ebc2deced89a7fdfd13befabf5f2872..707ba64eaa621ab488c19eb1b1e111e4dd92e870 100644
--- a/modules/planning/common/path/frenet_frame_path.h
+++ b/modules/planning/common/path/frenet_frame_path.h
@@ -31,21 +31,14 @@ namespace planning {
 class FrenetFramePath {
  public:
   FrenetFramePath() = default;
-
   explicit FrenetFramePath(std::vector<common::FrenetFramePoint> sl_points);
-
   virtual ~FrenetFramePath() = default;
 
   void set_frenet_points(const std::vector<common::FrenetFramePoint> &points);
-
   std::vector<common::FrenetFramePoint> *mutable_points();
-
   const std::vector<common::FrenetFramePoint> &points() const;
-
   std::uint32_t num_points() const;
-
   const common::FrenetFramePoint &point_at(const std::uint32_t index) const;
-
   common::FrenetFramePoint &point_at(const std::uint32_t index);
 
  private:
diff --git a/modules/planning/conf/dp_poly_path_config.pb.txt b/modules/planning/conf/dp_poly_path_config.pb.txt
index 2969738b70ffe6186e73b113b6cc75450f389c69..f6ed0e0bbf91e7dc3cd8849bd62aa79757cb7c5b 100644
--- a/modules/planning/conf/dp_poly_path_config.pb.txt
+++ b/modules/planning/conf/dp_poly_path_config.pb.txt
@@ -1,5 +1,5 @@
 sample_level: 8
-sample_points_num_each_level: 9
+sample_points_num_each_level: 1
 step_length_max: 10.0
 step_length_min: 5.0
 lateral_sample_offset: 0.5
diff --git a/modules/planning/optimizer/dp_poly_path/dp_road_graph.cc b/modules/planning/optimizer/dp_poly_path/dp_road_graph.cc
index 32d889b4acd0b228a3a0c48be3e62fa18d3fbf82..37e48935a4122bc9270e7f6156b7dfafd7041d3c 100644
--- a/modules/planning/optimizer/dp_poly_path/dp_road_graph.cc
+++ b/modules/planning/optimizer/dp_poly_path/dp_road_graph.cc
@@ -52,6 +52,7 @@ DpRoadGraph::DpRoadGraph(const DpPolyPathConfig &config,
 Status DpRoadGraph::find_tunnel(const ReferenceLine &reference_line,
                                 DecisionData *const decision_data,
                                 PathData *const path_data) {
+  CHECK_NOTNULL(decision_data);
   CHECK_NOTNULL(path_data);
   if (!init(reference_line)) {
     const std::string msg = "Fail to init dp road graph!";
@@ -147,6 +148,7 @@ Status DpRoadGraph::find_tunnel(const ReferenceLine &reference_line,
 bool DpRoadGraph::init(const ReferenceLine &reference_line) {
   _vertices.clear();
   _edges.clear();
+  _init_point.Clear();
   common::math::Vec2d xy_point(_init_point.path_point().x(),
                                _init_point.path_point().y());
 
diff --git a/modules/planning/optimizer/dp_poly_path/path_sampler.cc b/modules/planning/optimizer/dp_poly_path/path_sampler.cc
index 7448b45228354e14f4de7a2a44f2722117fc3467..52d61609ada04da03a6d1b17e8dec5adacc999f0 100644
--- a/modules/planning/optimizer/dp_poly_path/path_sampler.cc
+++ b/modules/planning/optimizer/dp_poly_path/path_sampler.cc
@@ -18,18 +18,23 @@
  * @file sampler.cpp
  **/
 #include <algorithm>
-#include <vector>
-#include <memory>
 #include <cmath>
+#include <memory>
+#include <vector>
 
 #include "modules/planning/optimizer/dp_poly_path/path_sampler.h"
 
+#include "modules/common/proto/path_point.pb.h"
+
+#include "modules/common/util/util.h"
+
 namespace apollo {
 namespace planning {
 
-using apollo::common::Status;
+using Status = apollo::common::Status;
+using SLPoint = apollo::common::SLPoint;
 
-PathSampler::PathSampler(const DpPolyPathConfig &config) : _config(config) {}
+PathSampler::PathSampler(const DpPolyPathConfig& config) : _config(config) {}
 
 Status PathSampler::sample(
     const ReferenceLine& reference_line,
@@ -39,45 +44,30 @@ Status PathSampler::sample(
   CHECK_NOTNULL(points);
   const double reference_line_length =
       reference_line.reference_map_line().accumulated_s().back();
-  const double lateral_sample_offset = _config.lateral_sample_offset();
-  double step_length = init_point.v();
-  step_length = std::min(step_length, _config.step_length_max());
-  step_length = std::max(step_length, _config.step_length_min());
-  double center_l = init_sl_point.l();
+  double level_distance =
+      std::fmax(_config.step_length_min(),
+                std::fmin(init_point.v(), _config.step_length_max()));
+
   double accumulated_s = init_sl_point.s();
-  for (size_t i = 0; i < _config.sample_level(); ++i) {
-    std::vector<::apollo::common::SLPoint> level_points;
-    if (std::abs(center_l) < lateral_sample_offset) {
-      center_l = 0.0;
-    } else {
-      center_l = center_l * _config.lateral_adjust_coeff();
-    }
-    accumulated_s += step_length;
-    const double level_start_l = center_l
-        - lateral_sample_offset
-            * (_config.sample_points_num_each_level() - 1) / 2;
-    for (size_t j = 0; j < _config.sample_points_num_each_level(); ++j) {
-      ::apollo::common::SLPoint sl_point;
-      sl_point.set_s(accumulated_s);
-      sl_point.set_l(level_start_l + j * lateral_sample_offset);
-      if (reference_line.is_on_road(sl_point)) {
-        level_points.push_back(sl_point);
+  for (size_t i = 0;
+       i < _config.sample_level() && accumulated_s < reference_line_length;
+       ++i) {
+    std::vector<SLPoint> level_points;
+    accumulated_s += level_distance;
+    double s = std::fmin(accumulated_s, reference_line_length);
+
+    int32_t num =
+        static_cast<int32_t>(_config.sample_points_num_each_level() / 2);
+    for (int32_t j = -num; j < num + 1; ++j) {
+      double l = _config.lateral_sample_offset() * j;
+      SLPoint sl = common::util::MakeSLPoint(s, l);
+      if (reference_line.is_on_road(sl)) {
+        level_points.push_back(sl);
       }
     }
-    if (level_points.empty()) {
-    	const double level_s = std::fmin(accumulated_s, reference_line_length);
-    	for (const auto level_l : {-lateral_sample_offset, 0.0, lateral_sample_offset}) {
-            ::apollo::common::SLPoint sl_point;
-            sl_point.set_s(level_s);
-            sl_point.set_l(level_l);
-            level_points.push_back(sl_point);
-    	}
-        if (accumulated_s > reference_line_length) {
-           return Status::OK();
-        }
-    }
     points->push_back(level_points);
   }
+
   return Status::OK();
 }
 }  // namespace planning