For　the　problems　that　ring　signature　needs　key　escrow,　has　some　security　risks,　and　cannot　avoid　malicious　key　generation　center　(KGC)　in　the　post-quantum　era,　we　design　a　certificateless　ring　signature　scheme　based　on　lattice　(L-CRSS).　In　our　scheme,　the　bimodal　Gaussian　distribution　is　used　to　improve　the　security　and　efficiency.　Compared　with　the　previous　ring　signature　scheme　based　on　lattice,　our　design　does　not　need　key　escrow,　does　not　disclose　the　signer＇s　identity,　can　avoid　malicious　KGC,　achieves　the　constant　signature　size,　and　has　higher　security　and　efficiency　in　the　post-quantum　era.　Finally,　under　random　oracle　model　(ROM),　we　prove　that　our　scheme　is　anonymous　against　the　full-key　exposure,　and　existentially　unforgeable　against　adaptive　chosen　message　attacks　(EUF-CMA).