This　paper　studies　the　management　of　three　yard　cranes　in　two　adjacent　container　blocks　in　line,　where　cranes　can　move　from　one　block　to　the　other.　Comparing　with　existing　literature,　the　new　multi-yard-crane　scheduling　problem　incorporates　different　constraints　together:　(i)　three　yard　cranes　are　deployed　simultaneously　in　two　adjacent　blocks,　(ii)　non-crossing　and　inter-crane　interference　constraints　of　yard　cranes　are　considered,　(iii)　the　processing　time　of　each　container　depends　on　its　real-time　location,　i.e.,　position-dependent　processing　times.　For　the　problem,　a　0-1　mixed　integer　programming　(MIP)　model　is　constructed　to　minimize　the　total　flow　time　to　reduce　the　total　container　storage　time　in　container　yards,　which　helps　to　save　container　yard　resources　and　increase　production　efficiency.　The　proposed　model　can　be　solved　optimally　by　CPLEX　for　small-size　instances.　As　the　concerned　problem　is　NP-hard,　a　fast　heuristic　and　an　improved　genetic　algorithm　are　devised　to　produce　near-optimal　solutions　for　large-size　instances.　Numerical　experiments　validate　the　developed　MIP　model　and　demonstrate　the　efficiency　of　the　proposed　algorithms.