[en] The EAST tungsten divertor was designed and manufactured in 2012-2014 shut down. First commissioning is during EAST 2014 plasma summer operation due May to July. Some weak points exposed and brought damages on some divertor modules. Reasons were analyzed and optimization was made. Around half year spent for analysis, divertor modules structure optimized manufacturing and reconstruction. The optimized divertor operated during 2015 summer plasma operation and demonstrate optimizations are efficiency. There is no issue for tungsten divertor during operation. EAST plasma heating power increased step by step and will up to 20MW in 2015 winter campaign plasma operation and will validate tungsten divertor heat exhausting capability. (author)