In　this　paper,　a　fast　algorithm　based　on　texture　is　proposed　to　select　the　mode　of　the　intra-frame　block　prediction.　The　variance　is　at　first　used　to　measure　the　smoothness　and　coarseness　of　the　texture,　then　the　intra-frame　mode　is　accordingly　selected　from　Intra_16　×　16,　Intra_8　×　8　and　Intra_4　×　4.　This　algorithm　combines　the　variance　and　the　threshold,　which　remarkably　reduces　the　time　complexity　and　improves　the　compression　efficiency.　Experiment　results　show　that　the　coding　time　can　reduce　above　50%,　Intra_8　×　8　included　and　the　coding　time　can　reduce　above　20%,　Intra_8　×　8　not　included,　whereas　the　bit　rate　and　the　PSNR　maintain　similar.