diff --git a/pest/Cargo.lock b/pest/Cargo.lock
new file mode 100644
index 0000000..c83b1ac
--- /dev/null
+++ b/pest/Cargo.lock
@@ -0,0 +1,180 @@
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diff --git a/pest/Cargo.toml b/pest/Cargo.toml
new file mode 100644
index 0000000..fb82658
--- /dev/null
+++ b/pest/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "pest"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+pest = "2.1.3"
+pest_derive = "2.1.0"
diff --git a/pest/src/main.rs b/pest/src/main.rs
new file mode 100644
index 0000000..d567e95
--- /dev/null
+++ b/pest/src/main.rs
@@ -0,0 +1,18 @@
+extern crate pest_derive;
+extern crate pest;
+
+use pest::Parser as PestParser;
+use pest_derive::Parser;
+
+#[derive(Parser)]
+#[grammar = "sample.pest"]
+struct SampleParser;
+
+
+fn main() {
+    let mut pairs = SampleParser::parse(Rule::expression, "111+222").unwrap_or_else(|e| panic!("{}", e));
+    println!("{:?}", pairs);
+    let a = pairs.next().unwrap().as_str().parse::<i64>().unwrap();
+    pairs.next();
+    let b = pairs.next().unwrap().as_str().parse::<i64>().unwrap();
+}
diff --git a/pest/src/sample.pest b/pest/src/sample.pest
new file mode 100644
index 0000000..a9e8499
--- /dev/null
+++ b/pest/src/sample.pest
@@ -0,0 +1,2 @@
+number = { ('0'..'9')+ }
+expression = { number ~ "+" ~ number }
\ No newline at end of file