[Solved]-How to change the distance between lines of grid?-Highcharts

These two should work. Use the one that fits you better.

        tickPositions
        tickPositioner

Ejamples:

http://jsfiddle.net/jfbffqe7/

http://jsfiddle.net/0xb2c8e5/

Edit: This should do the trick of what you requested in the comments. http://jsfiddle.net/0xb2c8e5/1/

yAxis: {
        tickPositioner: function(){
            return[0,30, 50, 100, 250];},
        tickPixelInterval: 1},

Use tickPixelInterval with value of one, and the only return the ticks you want to see.