1.Lib\site-packages\vnpy路径下新建user_tools文件夹,放入pricetick.py
pricetick.py内容如下：

import json
import os
class PRICETICK(object):
    PATH = os.environ["USERPROFILE"] + "\\.vntrader\\unit.json"
    PRICE_TICK = 0.0  #最小跳动点 float
    UNIT = 0           #合约乘数 int

    def get_unit(self,symbol):
        with open(self.PATH,"r",encoding="utf_8") as f:
            result = json.load(f)
        for key_symbol in result:
            if key_symbol == symbol:
                self.PRICE_TICK = float(result[symbol][0])  #json读取最小跳动点
                self.UNIT = int(result[symbol][1])          #json读取合约乘数
                break
        return self.PRICE_TICK,self.UNIT

2. .vntrader\unit.json 在.\vntrader文件夹下，新建unit.json, json文件存储所有标的最小跳动点，合约乘数
unit.json内容如下：

{    
    "IF":["0.2","300"],
    "IC":["0.2","200"],
    "IH":["0.2","300"],
    "IM":["0.2","200"],
    "T":["0.005","10000"],
    "TF":["0.005","10000"],
    "TS":["0.005","20000"],
    "TL":["0.01","10000"],
    "AU":["0.02","1000"],
    "AG":["1","15"],
    "CU":["10","5"],
    "AL":["5","5"],
    "ZN":["5","5"],
    "PB":["5","5"],
    "NI":["10","1"],
    "SN":["10","1"],
    "RB":["1","10"],
    "WR":["1","10"],
    "I":["0.5","100"],
    "HC":["1","10"],
    "SS":["5","5"],
    "SF":["2","5"],
    "SM":["2","5"],
    "JM":["0.5","60"],
    "J":["0.5","100"],
    "ZC":["0.2","100"],
    "FG":["1","20"],
    "SP":["2","10"],
    "FU":["1","10"],
    "LU":["1","10"],
    "SC":["0.1","1000"],
    "BC":["10","5"],
    "EC":["0.1","50"],
    "BU":["1","10"],
    "PG":["1","20"],
    "RU":["5","10"],
    "NR":["5","10"],
    "L":["1","5"],
    "TA":["2","5"],
    "V":["1","5"],
    "EG":["1","10"],
    "MA":["1","10"],
    "PP":["1","5"],
    "EB":["1","5"],
    "UR":["1","20"],
    "SA":["1","20"],
    "C":["1","10"],
    "A":["1","10"],
    "CS":["1","10"],
    "B":["1","10"],
    "M":["1","10"],
    "Y":["2","10"],
    "RM":["1","10"],
    "OI":["1","10"],
    "P":["2","10"],
    "CF":["5","5"],
    "SR":["1","10"],
    "JD":["1","10"],
    "AP":["1","10"],
    "CJ":["5","5"],
    "PF":["2","5"],
    "PK":["2","5"],
    "AO":["1","20"],
    "LC":["50","1"],
    "SI":["5","5"],
    "BR":["5","5"],
    "RR":["1","10"],
    "LH":["5","16"],
    "PX":["2","5"],
    "SH":["1","30"]
}

3.在自己的策略中调用

from vnpy.user_tools.pricetick import PRICETICK   
初始化时候def __init__()：
实例化 self.contract = PRICETICK()
获取标的   self.symbol = "".join(re.findall(r"\D+",self.get_data()["vt_symbol"].split(".")[0])).upper()
提取最小变动价格，合约乘数   self.PRICE_TICK,self.UNIT = self.contract.get_unit(self.symbol)  #从json提取最小变动价位，合约乘数

感谢分享！