The present study was aimed to formulate Solid lipid nanoparticles loaded thermo-reversible nasal In-situ gel containing Hibiscus Rosa sinensis extract by cold technique to impart better anti-depressant activity. It can improve the penetration of drug to CNS and shows faster pharmacological action. Thermo- reversible nasal In-situ gel were prepared by Poloxamer188 (PluronicF68) with mucoadhesive polymer polymers Carbopol 940. Nasal drug delivery systems are better imparts the Anti-depressant activity. The pH of the formulations was found to be within the range of 6.4 to 7.4. Viscosity of solid lipid nanoparticles loaded thermo- reversible nasal in-situ gel was found to be (212 cps to 409.6) for the sol, where as for the gels it was upto (38969 cps). The Spreadability SLN loaded In-situ nasal gel was found to be 25.19 (gm.cm/sec).The optimized formulation showed a drug release of 72.17% in 5hrs.