diff --git a/.gitignore b/.gitignore
index 7000fedd25..7f7b109c38 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,4 +42,7 @@ profile.cov
 # VS Code
 .vscode
 
+pkg
+pkg/*
+
 tests/spec-tests/
diff --git a/docs/audits/2017-04-25_Geth-audit_Truesec.pdf b/doc/audits/2017-04-25_Geth-audit_Truesec.pdf
similarity index 100%
rename from docs/audits/2017-04-25_Geth-audit_Truesec.pdf
rename to doc/audits/2017-04-25_Geth-audit_Truesec.pdf
diff --git a/docs/audits/2018-09-14_Clef-audit_NCC.pdf b/doc/audits/2018-09-14_Clef-audit_NCC.pdf
similarity index 100%
rename from docs/audits/2018-09-14_Clef-audit_NCC.pdf
rename to doc/audits/2018-09-14_Clef-audit_NCC.pdf
diff --git a/docs/audits/2019-10-15_Discv5_audit_LeastAuthority.pdf b/doc/audits/2019-10-15_Discv5_audit_LeastAuthority.pdf
similarity index 100%
rename from docs/audits/2019-10-15_Discv5_audit_LeastAuthority.pdf
rename to doc/audits/2019-10-15_Discv5_audit_LeastAuthority.pdf
diff --git a/docs/audits/2020-01-24_DiscV5_audit_Cure53.pdf b/doc/audits/2020-01-24_DiscV5_audit_Cure53.pdf
similarity index 100%
rename from docs/audits/2020-01-24_DiscV5_audit_Cure53.pdf
rename to doc/audits/2020-01-24_DiscV5_audit_Cure53.pdf
diff --git a/docs/postmortems/2021-08-22-split-postmortem.md b/doc/postmortems/2021-08-22-split-postmortem.md
similarity index 100%
rename from docs/postmortems/2021-08-22-split-postmortem.md
rename to doc/postmortems/2021-08-22-split-postmortem.md
diff --git a/doc/study_state_machine.md b/doc/study_state_machine.md
new file mode 100644
index 0000000000..90613070b0
--- /dev/null
+++ b/doc/study_state_machine.md
@@ -0,0 +1,7 @@
+# 找到和公链通信的代码
+
+# 找到账本
+
+# 找到交易代码
+
+# 找到币的地址
\ No newline at end of file