Acid fracturing is one of the most commonly adopted techniques and methods to improve the production of carbonate reservoir, however its resulting acid etched fractures are limited in length even in large scale filed application. Hydraulic fracturing, on the country, can reach the goal to generate long fractures. To explore new developing technology for carbonate reservoir, both experiments and field study on utilization of composite acid fracturing, a combination of hydraulic fracturing and proppant-carrying acid fracturing, were conducted. In this work, Ordovician carbonate cores dilled from Tarim basin was used, short-term flow conductivity of fractures generated by proppant-carrying hydraulic fracturing, acid-etched fracturing, proppant-carrying acid fracturing and the composite acid fracturing combined hydraulic and acid fracturing with proppant were measured under simulated high pressure and temperature reservoir condition to evaluate this new technique. Experimental results showed that a good conductivity could be realized by composite acid fracturing combined hydraulic and acid fracturing with proppant on carbonate reservoirs. Based on the experiment results, a field work was successfully conducted, in which the composite acid fracturing scheme were designed and optimized on four different wells with a 100% success rate. The resulting great production increasing effect sustained the utilization potential of the composite acid fracturing on carbonate reservoirs.