diff --git a/observation/src/biolatency/biolatency.c b/observation/src/biolatency/biolatency.c
index c251224290cfcf36dba4367a4bd438e4a3d8c251..965304e6f36aef7e7493aba3b0954881fbd42b48 100644
--- a/observation/src/biolatency/biolatency.c
+++ b/observation/src/biolatency/biolatency.c
@@ -26,4 +26,68 @@ static struct env {
 static volatile sig_atomic_t exiting;
 
 const char *argp_program_version = "biolatency 0.1";
-const char *argp_program_bug_address = "Jackie Liu <liuyun01@kylinos.cn>";
\ No newline at end of file
+const char *argp_program_bug_address = "Jackie Liu <liuyun01@kylinos.cn>";
+
+static error_t parse_arg(int key, char *arg, struct argp_state *state)
+{
+	static int pos_args;
+
+	switch (key) {
+	case 'h':
+		argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
+		break;
+	case 'v':
+		env.verbose = true;
+		break;
+	case 'T':
+		env.timestamp = true;
+		break;
+	case 'm':
+		env.milliseconds = true;
+		break;
+	case 'Q':
+		env.queued = true;
+		break;
+	case 'D':
+		env.per_disk = true;
+		break;
+	case 'F':
+		env.per_flag = true;
+		break;
+	case 'c':
+		env.cgroupspath = arg;
+		env.cg = true;
+		break;
+	case 'd':
+		env.disk = arg;
+		if (strlen(arg) + 1 > DISK_NAME_LEN) {
+			warning("Invalid disk name: too long\n");
+			argp_usage(state);
+		}
+		break;
+	case ARGP_KEY_ARG:
+		errno = 0;
+		if (pos_args == 0) {
+			env.interval = strtol(arg, NULL, 10);
+			if (errno || env.interval <= 0) {
+				warning("Invalid interval\n");
+				argp_usage(state);
+			}
+		} else if (pos_args == 1) {
+			env.times = strtol(arg, NULL, 10);
+			if (errno || env.times <= 0) {
+				warning("Invalid times\n");
+				argp_usage(state);
+			}
+		} else {
+			warning("Unrecognized positional argument: %s\n", arg);
+			argp_usage(state);
+		}
+		pos_args++;
+		break;
+	default:
+		return ARGP_ERR_UNKNOWN;
+	}
+
+	return 0;
+}