Abstract: A high-density integrated circuit module structure comprises a substrate and a heat sink at least wherein the substrates form a reversely-staggered contacting stack structure by electrically contacting heat sinks and heat conductors on the heat sink have a non-flat structure at least to realize the present invention which extends the product's functions within an electronic product's restricted height and has a better vibration resistance capability, heat dissipation effect, and no steps involving junctions between solder balls and a carrier in an assembling procedure to simply an assembling procedure with improved functions, increased capacity, and reduced manufacturing costs.