据数据监测，2015年至今，北方主要港口铁矿石的到港量是呈现较大的波动。从4月份至6月中旬，整个北方六大港口到港情况是处于全年低点，而在此时矿价也是有一个月的反弹阶段。从八月份开始，到港情况开始回升，周均到港量1097.5万吨，今年的周均水平1001万吨。我们通过库存的变化情况和到港的情况，可以推算北方六大港口的供给和需求量化情况。我们通过数据可以看出，从8月下旬开始，供给不应求的情况正在转变。

According to the monitoring data, since 2015, the north main port iron ore to the port is to present a larger amount of volatility.From the middle of April to June, the whole northern six big port to port is low throughout the year, and ore price at this time also is to have a month of rebound stage.Since August, to the port situation began to rebound, weeks are to the port capacity is 10.975 million tons, week of this year's average of 10.01 million tons.We through the change of inventory and to the port, the six major ports can be calculated according to the supply and demand of quantification.We through the data we can see that begins in late August and supply should not be in the situation is changing.

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