iamond bits manufacturing technology has come into being as an independent subject inChina. It bases on rock fragmentation mechanics, metallic materials science, electrochemistry,bit morphology, bit hydraulics. This new subject, as a branch of exploration engineering, wasformed through in - depth research of the above mentioned subjects.The main methods of manufacturing diamond bits in China are as follows: sintering processof hot pressing, infiltration process of vibration, infiltration process of cold pressing, electroplating with low temperature, braze welding, electric spark sintering. This paper explains theprinciples of each method, process and relevant methods of manufacturing bits with differentuses.The properties of diamond bit! are guarranteed by contr6lling certain amount of quality index, to make them conforming to the standard, and to keep the quality stable during batch production. Furthemore, quality control is also the basis for arbitration between users and manufacturers.The index for bit quality control are as follows: abrasive resistance, bending strength,toughness against impact, torsional strengh, hardness of matrix, quality of diamond, density ofdiamond, grain size of diamond, density of matrix.The computer plays an important role in bit designing and manufacturing. This paper emphatically introduces date base, knowledge base, inference system, parameter drawing systemfor bit manufacturing and automation of sintering process. The expert system can tell the usersthe type of bit, parameters of matrix, parameters of diamond, formular of matrix, sinteringtechnique and drawing of the end product, as long as the users input the data of properties ofrock to be drilled into the computer. The quality of every bit is identical and conforming to theinitial design. This system substantially improves the quality of bits.