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In this paper, research on butt laser welding, lap laser welding, and T-type laser welding of 2mm thick medium carbon alloy steel plate of 30CrMnSi was made.First, changing welding speed, which affect welding quality, get the optimal welding speed under different powers. Then, through the comparing of the welding deformation, the mechanical properties, the microstructure and the microhardness of welded joints under these conditions, won the final optimal welding parameters. In mechanical properties testing, the tensile strength of welded joints of medium carbon alloy steel 30CrMnSi laser welding is stronger than the tensile strength of the materials, because of the grain of the weld and heat affected zone has been smaller and more equality in laser welding. At the same time, I have analyzed of the organizations and microhardness of the laser welded joints of medium carbon alloy steel 30CrMnSi. There is lath martensite in weld areas. There is the highest microhardness in HAZ, because there are the smallest grains in HAZ.In the process, there were the various designing of welding fixture.
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