By　measuring　the　velocities　of　the　P-wave　and　S-wave　in　three　orthotropic　directions　including　parallel　and　vertical　directions　to　the　stratum　of　the　rock　samples　for　slate,　phyllite,　mylonite　and　metasandstone,　and　based　on　the　wave　velocities　of　other　rocks　from　the　relevant　studies,　the　anisotropic　effect　of　wave　velocity　ratio　of　the　P-wave　and　S-wave　for　most　rocks　is　put　forward.　The　anisotropic　effect　is　controlled　by　the　lithologic　characteristics,　and　apparent　for　slate　and　phyllite,　while　not　for　the　other　two　kinds　of　rocks,　mylonite　and　metasandstone.　The　wave　velocity　ratio　vertical　to　the　stratum　of　the　rock　samples　is　usually　less　than　that　in　parallel　direction,　and　the　relative　increment　of　wave　velocity　ratio　between　the　vertical　direction　and　the　parallel　direction　decreases　as　the　wave　velocity　ratio　in　vertical　direction　gradually　increases.　By　treating　the　rock　as　the　transverse　isotropic　elastic　medium　and　using　numerical　test　of　the　wave　velocity　function,　the　property　is　theoretically　validated.