A new way was provided for in situ synthesized FCC catalyst. Characterization and evaluation results indicated the catalyst is more suitable for cracking resid feed because of its unique manufacturing process which makes this catalyst has appropriate pore structures in which large resid molecules are more accessible to the active sites. The high zeolite content (above 40%) keeps the catalyst having higher activity and selectivity. These advantages ensure the in situ catalyst developed more adaptable for cracking resid and resid-containing feedstocks, particularly the feed containing large amounts of contaminant metals.