The purpose of this study was to characterize affect of DCA (double cut alternate tapping system) on renew bark and TPD (tapped panel dryness) symptom with RRIM 600 clone. This expriment was set up in Chachoengsao Rubber Research Center since 1999. Experimental design was RCB comprising 4 replications with 6 treatments: I). S/2 d2, 2). S/3 d2 ET 2.5% 4/y, 3-5). S/2 d3 ET 2.5% 4, 6 and 8/y and 6). DCA ((2xS/2 d2 (t,t)). The 2"d phase focus on l l -l 5th tapping year. The results show yield of DCA and S/3 d2 ET 2.5% 4/y were 1,760 and 1,819 kg/ha/year or higher 12% and 16% than S/2 d2 consequence. However, S/2 d3 ET 2.5%, 4-8/y were the highest average yield 36-44% but yield in term of kg/tree/year and kg/ha/year were lower than the others tapping system 15%, according to less tapping days than 32 days in comparison with d2. Over a period of 15 years, compared to a single cut tapping system (S/2 d2) of equivalent intensity, DCA increased cumulative rubber production by 10%. DCA, S/2 d2 and S/3 d2 ET 2.5% 4/y also resulted in higher TPD rates 33-34% than S/2 d3 ET 2.5% 4, 6 and 8/y which occurrence 19-24%.