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@Vishwas R ,Thank you for replay question. I added the sort before the chart,render() , I leave you the new code : function updateEcg() { $.getJSON(“/data_ecg4.php”, function (result) { if (dataLength !== result.length) { for (var i = dataLength; i < result.length; i++) { data.push({ x: parseInt(result[i].valuex), y: parseFloat(result[i].valuey), }); if (data.length > 478) { data.shift(); }} dataLength = result.length; data.sort((a,b)=>a-b); chart.render();} }); Is correct my idea? or I need to change something? , thanks in advice.