Core clamps are the main components of core analysis, displacement and extraction experiments. Depending on their usage, product structure, rock sample specifications, pressure resistance, corrosion and temperature resistance measurement points, they are divided into TY-2C~GW-1, conventional clamps, resistivity clamps, acoustic electro osmotic parameter clamps, etc; The conventional rock samples are 25mm and 38mm in diameter, and there are also non-homogeneous rock samples with dimensions of 45x45mm and triaxial core clamps with diameters above 450mm; In terms of pressure resistance of the gripper, it can be divided into conventional 20MPa, 32MPa, and 50MPa, and higher pressures such as 70MPa and 100MPa can be made according to requirements. The arrangement of independent heating and temperature control facilities and the number of measuring points for the gripper needs to be explained in advance.