Based on the Schaeffler diagram, the solidification cracking susceptibility of austenitic alloys during laser welding was investigated systematically. Specimens with different chemical compositions were made up by laser welding with hot different Nickel-based wires. Brittleness temperature range (BTR) could be obtained by combining the result of solidification crack from laser Trans-Varestraint test with the temperature profile of weld bead during laser welding. Then the solidification cracking susceptibility was studied quantitatively using BTR. With the increase of the ratio of Cr equivalent to Ni equivalent (Creq / Nieq) from 0.1 to 1.2, the BTR tended to increase firstly and then decrease. This showed that the solidification cracking susceptibility had a tendency of increasing and decreasing with increasing Creq / Nieq. While, the solidification cracking susceptibility was relatively higher in the middle region, and the susceptibility was lower at the sides of the single phase austenite region in the single phase austenite region of the Schaeffler diagram. When the contents of P + S, Nb and Si alloy elements were relatively higher, the low melting point eutectic compound – segregated liquid film could be formed at the grain boundary and sub-grain boundary, leading to increase the solidification cracking susceptibility. In addition, the effect of Nb on the solidification cracking susceptibility was much higher than that of P + S under a certain condition.